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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

Hy!
i have a problem and no solution... help please...
and here i go :

i have Mandrake 10 machine with a PPPoE connection to my ISP and a lan connection to my other computers

i want to make NAT so my other computers from lan to have internet access.
so i have eth1(lan): with the ip 10.0.0.200
and ppp0: with ip 17.18.9.64 and it's gateway(80.81.181.3)

i have don NAT and it is working .. but not how it should...

i used iptraf to see what happens when a connection from lan is made this is happening:

the ip from lan 10.0.0.3 connects to 10.0.0.200 -> eth1 .. nat is done and
on ppp0 it gets out with 17.18.9.64 .. ok all good until now but the problem is that it get's out but nothing comes in .. it sends the SYN flag and that's all, it doesn't receive anything back... why not???